The role of polyacrylamide in printing and dyeing plants
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With the rapid development of the textile dye industry, the discharge of printing and dyeing wastewater that does not meet the standards is becoming more and more serious. The relevant departments have also checked the water discharge very strictly. Therefore, many enterprises cannot take it lightly and must strengthen the emission standards. Supervise and avoid small losses. The treatment of sewage in the printing and dyeing industry usually uses polyacrylamide, so what role does polyacrylamide play in textile printing and dyeing? What are its use methods and precautions? The following is a detailed introduction of Shouxin Chemical.
The role of polyacrylamide in the printing and dyeing industry:
1. In the textile industry, polyacrylamide flocculant as a sizing agent and finishing agent for fabric post-treatment can produce a protective layer of compliant, anti-wrinkle and mold-resistant;
2. The flocculant as a post-treatment agent can prevent static electricity and flame retardant of the fabric;
3. When used as a printing and dyeing auxiliary, it can make the product have strong adhesion fastness and high vividness, and can also be used as a non-silicon polymer stabilizer for bleaching;
4. This is the key to the efficient purification of wastewater from the printing and dyeing textile industry.
Printing and dyeing wastewater features:
Printing and dyeing wastewater has a large amount of water. Printing and dyeing consumes 100 to 200 tons of water per ton of textiles, of which 80 to 90% become waste water. Textile printing and dyeing wastewater has the characteristics of large water volume, high organic pollutant content, large alkalinity and large water quality change. It is one of the industrial wastewaters that are difficult to treat. The wastewater contains dyes, slurries, additives, oil agents, acid and alkali, and fiber. Impurities, sand materials, inorganic salts, etc.
The key to the coagulation treatment of printing and dyeing wastewater is to choose a suitable flocculant. The flocculants commonly used in the treatment of printing and dyeing wastewater are mainly aluminum sulfate, iron sulfate, ferric chloride and cationic polyacrylamide in the later stage. These flocculants are It is effective to treat some water-insoluble dye wastewaters, such as disperse dyes, vat dyes, sulphur dyes, COD and chromaticity removal rates are very high.
Instructions:
1. Dissolution method: Dissolve the solid particles into an aqueous solution of a concentration of 1‰--5‰ before use to quickly exert efficacy. When adding medicine, it should adopt the method of gradually taking the family medicine, slowly put it into the water, and then dissolve it evenly in water.
2. Addition of the solution: Usually, an aqueous solution of about 0.5 to ‰-1 ‰ is added. However, in the case of high concentration and high viscosity of the suspension, it is recommended to further dilute the aqueous solution to 0.1%. It will be easy to mix and exert sufficient effects.
3. The cation has a lower molecular weight than the anion and the viscosity is also weaker than the anion. Therefore, the cation and nonionic ratio concentration standards are slightly higher than the anion. (Depending on the situation, it is also possible to adjust the concentration turbidity to a high concentration according to the water concentration, and the concentration is low. The turbidity is low to increase the concentration appropriately). The recommended concentration is 5‰-1%.
Precautions:
1. When preparing PAM aqueous solution, it should be carried out in enamel, galvanized, aluminum or plastic drum. It should not be prepared and stored in iron container.
2. When dissolving, care should be taken to slowly add the product to the dissolver with stirring and heating measures. Avoid solidification, prepare the solution at a suitable temperature, and avoid mechanical shearing for a long time. It is recommended that the stirrer be 60-200 rpm, otherwise the polymer will be degraded and the effect will be affected.
3, PAM aqueous solution should be ready for use now, when the solution is placed for a long time, its performance will gradually decrease depending on the water quality.
4. After the flocculant aqueous solution is added to the suspension, if the stirring is intense for a long time, the already formed flocs will be destroyed.